CA1162486A - Record changer - Google Patents
Record changerInfo
- Publication number
- CA1162486A CA1162486A CA000372924A CA372924A CA1162486A CA 1162486 A CA1162486 A CA 1162486A CA 000372924 A CA000372924 A CA 000372924A CA 372924 A CA372924 A CA 372924A CA 1162486 A CA1162486 A CA 1162486A
- Authority
- CA
- Canada
- Prior art keywords
- record
- arm
- detecting
- lever
- record changer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
- G11B3/02—Arrangements of heads
- G11B3/08—Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers
- G11B3/085—Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers using automatic means
- G11B3/08503—Control of drive of the head
- G11B3/08506—Control of drive of the head for pivoting pick-up arms
- G11B3/08516—Control of drive of the head for pivoting pick-up arms using magnetic detecting means
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
- G11B17/08—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records
- G11B17/12—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records with axial transfer to the turntable from a stack with a vertical axis
- G11B17/16—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records with axial transfer to the turntable from a stack with a vertical axis by mechanism in stationary centre post, e.g. with stepped post, using fingers on post
- G11B17/162—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records with axial transfer to the turntable from a stack with a vertical axis by mechanism in stationary centre post, e.g. with stepped post, using fingers on post with means for detecting the diameter of the record
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
- G11B3/02—Arrangements of heads
- G11B3/08—Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers
- G11B3/085—Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers using automatic means
- G11B3/08535—Driving the head
- G11B3/08538—Driving the head the head being driven by the same means as the record can
- G11B3/08541—Driving the head the head being driven by the same means as the record can for pivoting pick-up arms
- G11B3/08545—Driving the head the head being driven by the same means as the record can for pivoting pick-up arms driven by cams
Landscapes
- Automatic Disk Changers (AREA)
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A record changer has a center spindle on which records are held so that they may drop onto a turntable and may be played. The record changer includes a tone arm for repro-ducing the signals which are recorded in a record, detecting means fox detecting the position of the tone arm, and operating means for controlling the drive and stop of the record changer.
This record changer is driven, when the aforementioned operating means is operated while it is being detected by the detecting means that the arm is in its inoperative position, and is stopped when the operating means is operated while it is being detected by the detecting means that the arm is in its operative position.
A record changer has a center spindle on which records are held so that they may drop onto a turntable and may be played. The record changer includes a tone arm for repro-ducing the signals which are recorded in a record, detecting means fox detecting the position of the tone arm, and operating means for controlling the drive and stop of the record changer.
This record changer is driven, when the aforementioned operating means is operated while it is being detected by the detecting means that the arm is in its inoperative position, and is stopped when the operating means is operated while it is being detected by the detecting means that the arm is in its operative position.
Description
~6'~6 BACK GROUN D OF THE I NVENT I ON
Field of the Invention:
The present invention relates to a record ch~nger, and more particularly to a record changer of the type, in which a record is held on a center spindle and is made to drop onto a turntable so that it may be played.
Description of the Prior Art:
One sort of a conventional record changer with a center spindle is disclosed in U.S. Patent ~o.3,489,41~ (allowed to H.J. Fortune et al.). ~he center spindle of the changer serves for supporting and dropping records in sequence with a mechanism within the center support for sensing the pre-sence or absence of a record for controlling an automatic shut-off mechanism. With the center support for dropping and sensing the records, there is also provided an edge support for the sole purpose of balancing the records. The tone arm is also balanced by a counterweight which is resiliently supported from the tone arm in all directions of relative movement between the tone arm and the counterweight.
However/ the conventional changer disclosed is purely mechanically arranged. In the mechanical arrangement, there are provided a start button and a stop button, the former of which is pushed when it is intended to play the record and the latter of which is pushed when it is intended to stop the record playing operation. With this construction, however, it is not preferred that the number of the ope-rating buttons i.5 increased and that the operabili-ty is deteriorated.
In this record changer, still moreover, the returning mechanism of the tone arm and the dropping mechanism of the records are so interlocked that the record always drops when the tone arm is automatically returned. This results in that the record drops, too, even in case the auto-returning operation is performed in response to the stop command. In order to ensure safety, moreover, the lead-in operation is performed upon the subsequent start after at least the drive mechanism effects the auto-returning operation. As a result, there arises a problem that the record which has dropped in response to the drop command fails to be played. In order to solve this problem, there is conceivable a method, in which the returning operation is performed in a manual manner after the function has been set at a non-automatic mode and after the power supply circuit has been broken. However, this method is not preferred because it is inferior in operability.
Furthermore, in order to perform the manual ope-ration as well as the automatic changing operation in the record changer having the construction thus far described, there are provided an operating button for selecting the automatic and manual modes so that the automatic operation can be effected, when it is shifted to the automatic mode, whereas the manual operation can be effected when it is shifted to the manual mode. In other words, the automatic and manual operations belong to absolutely independent operating systems so that they cannot be interchanged. As a result, the operability is inferior, and the number of the operating buttons is not a few.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an improved record changer which is excellent in its operability.
Another object of the present invention is to provide a record changer which has a reduced number o ope-rating buttons but can perform complicated operations.
A further object of the present invention is to provide a record changer with sinyle operating means which can function as both drive means and stop means.
A still further object of the present invention is to provide a record changer wherein records are prevented from dropping down from a center spindle when a tone arm is returned upon the stopping operation.
A still further object of the present invention is to provide a record changer which can be manually operated and in which the manual operation can be ccntinuously shifted to the automatic operation.
In accordance with one aspect of the present invention, there is provided a record changer of the type, in which records are held on a center spindle and are made to drop onto a turntable so that they are played, which changer includes:
a tone arm for reproducing the signals recorded in the records;
detecting means for detecting the position of the tone arm;
and operating means for controlling the drive and stop of the record changer; which changer is characterized in that it is driven, when the operatina means is operated while it is being detected by the detecting means that the arm is in its inoperative position, and is stopped when the operating means is operated while it is being detected by said detecting means that the arm is in its operative position.
The above, and other objects, features and advan-tages of the invention will be apparent from the following detailed description of an illustrative embodiment which is to be read in connections with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view of a record player with an automatic record changer according to one embodiment S of the present invention;
Fig. 2 is an exploded perspective view of the inside mechanism of the record player;
Fig. 3 is a top plan view of the same;
Fig. 4 is a circuit diagram of the control circuit of the record player;
Fig. 5 is a flow chart showing the operations of the record player;
Fig. 6 is a sectional view of an essential portion of a center spindle showing the operations of the center spindle;
Fig. 7 is a top plan view of an essential portion of a trigger mechanism showing the starting operation;
Fig. 8 is a top plan view of a main lever assembly showing the swinging operation of the main lever;
Fig. 9 is an elevational view of an arm lifter showing the lifting and lowering operations of a tone arm;
Fig. 10 is a top plan view of an actuating lever assembly showing the toggle operation of the actuating lever for the lead-in and automatic returning operations;
Fig. 11 is a top plan view of a record size selecting mechanism showing the setti~g operation of a size cam;
Fig. 12 is a top plan view of a record detecting assembly showing the operation for detecting the presence or absence of a record;
Fig. 13 is a top plan view of a record end detecting i?~$i~
mechanism showing the record end detecting operation and the returning operation; and Fig. 14 is a t2 plan view of the main lever assembly showing the holding operation of a size select lever by the size cam.
DESCRIPTION OF TI~E PREFERRED EMsoDIMENT
. . ~
Referring now to Fig. 1, a record player with an automatic record changer embodying the present invention has a top panel 1 which is formed with a large circular opening 2.
In this opening 2, there is arranged a turntable 3 which is fitted in a center shaft 4 such that the former frictional~y engages with the latter. A center spindle 5 is detachably mounted in the centex shaft 4. At the side of the turntable 3 and above the panel 1, there is arranged a tone arm 6 which is adapted to be swlmg by a swing shaft 7. A cartridge 8 is attached to the leading end of the tone arm 6. This tone arm 6 in turn is supported on an arm rest 9 when in a rest position.
On ~he other hand, a front panel of the record player is equipped with a start/stop switch 10. There are arranged in a row on the aforementioned panel 1, a size selecting switch 11, a speed selecting switch 12 and a repeat switch 13. On the panel 1, moreover, there is arranged an operating lever 14 so that an arm lifter 15 can be manually operated.
The inside mechanism of the record player will now be described with reference to Figs. 2 and 3. A brake plate 16 is fixed to the swing shaft 7 of the aforementioned tone arm 6. A lead-in lever 17 and a size reset lever 18 are rotatabiy mounted on the swing shaft 7 in a manner to overlap the brake plate 16. The lead-in lever 17 is connected to the brake plate 16 by means of a coil spring 19. On the other hand, the lead-in lever 17 is integrally provided with a projection 20, which is made oper~tive to push an arm switch 22 fixedly held on a supporting plate 21. At the side of the afore-mentioned brake plate 16, on the other hand, there arearranged a brake lever 23 and an actuating lever 24, both of which are ~otatably supported by a common pivot pin 25.
Moreover, a coil spring 26 is attached to one end of the actuating lever 24, and a compression coil spring 27 is interposed between the hrake lever 23 and the actuating lever 24.
Below the turntable 3, there is arranged a main lever 28 which is rotatably supported by means of a pivot pin 29.
And, an actuating lever 30 is held through a pin 31 on the leading end ~f that lever 28. Moreover, the actuating lever 30 is being reversable by a reverse lever 32 to thereby effect the toggle motions. The reverse lever 32 is supported on the main lever 28 through a pin 33 and is pushed b~ a compression coil spring 34. To the upper side of the main lever 28, on the other hand, there is attached a cam plate 35 of a synthetic resin, which has its cam portion 36 abutting against the side portion of a lifter lever 37. This lifter lever 37 has its leg portion rotatably supported by a pin 38 and its leading end portion abutting against the lower end of the support shaft of the aforementioned arm lifter 15.
At the side of the main lever 28, there is arranged a size cam 40 which is rotatably supported by means oE pivot pin 39. The size cam 40 has its one side formed with two stepped portions 41 and 42, which are adapted to abut against the arm portion 43 of the aforementioned lead-in lever 17 to thereby effect the size selection. That size cam 40 is further formed with three wall portions 46, 47 and 48 which are adapted to abut against the operating element 45 of a rotary plunger 44 having three positions. The size cam 40 thus constructed is connected through a pin 49 to one end of a rod 50, the other end of which is connected through a pin 51 to a feedback lever 52. The feedback lever 52 is rotatably supported by means of a pin 53 and has on its leading end a pin 54 adapted to abut against a first small cam portion 56 which is formed on the lower side of a cam plate 55. This cam plate 55 is formed on its outer peripheral portion with a second cam portion 57 which is adapted to abut against the leading end pin 59 of an actuating lever 58.
By a pin 61 supporting the acutating lever 58, there is also rotatably supported a detecting lever 60, which is formed integrally with such a pro~ection 62 as is adapted to push a switch 63 for detecting the presence or absence of a record. On the other hand, the detecting lever 60 and the aforementioned actuating lever 55 are connected by means of a coil spring 64.
Above the aforementioned cam plate 55, there is arranged in an overlapping manner a drive gear 65, both of which are fixed to a common pivot pin 66. The portion of the drive gear 65, which is toothed in its outer circumference, is further formed with a toothless or notched portion 67.
And, the drive gear 65 thus formed is so constructed that it can engage with a pinion 6~ which is fixed to the aforementioned center shaft 4. On the other hand, this center shaft 4 is integraily formed on its outer circumference with a pawl 69, which is adapted to abut against the leading end of a start *~
lever 70 which is supported through a pin 71 on the upper end surface of the drive gear 65. Below the start lever 70, there is arranged an actuating lever 72 such that they are supported on the drive gear 65 by means of l:he cornmon pin 71.
5 The actuating lever 72 has a pin 73 which is inserted in-to an opening 74 formed in the start lever 70. The actuating lever 72 is integrally formed with a downward projection 75 which is positioned to face a land 77 formed at the leading end of a trigger lever 76. This trigger lever 76 is rotatably supported on a pin 78/ and a pin 79 mounted on the lever 76 is adapted to be pushed by a plunger lever 80. The plunger lever 80 has its leading end formed with a projection 81 which constructs the rod of a plunger 82.
The aforementioned drive gear 65 has its lower end face formed with a cam groove 83 which is adapted to engage with a pin 84 anchored at the leading end of the aforementioned main lever 28. Moreover, this main lever 28 has its leading end formed with a tab 85 which is adapted to push a microswitch 86. Moreover, a pin 87, which is anchored at that main lever ~0 28, is adapted to push the end portion of the.aforementioned actuating lever ~4. At the side of the drive gear 65, on the other hand, there is arranged a motor 88, by which the afore-mentioned turntable 3 is rotationally driven through such a belt 90 as is made to run on the pulley 89 of that motor 88.
The center spindle 5 which is attached to the afore-mentioned center shaft 4 will be described in the following.
The spindle 5 is molded of a synthetic resin such as a poly-phenylene sulfide resin and is formed with a split slit 91 all over i ts length, as shown in Fig. 6. Moreover, the center spindle 5 is made resiliently deformable in the radial direction by the action of that split 91 and is press-fitted in a sleeve 92 which is fixed to the frame of the record player through the bore of the center shaft 4. In the split slit 91, moreover, there is arranged a spindle lever 93, which is S formed with such a groove 94 as can receive a ring 95 so that the lever 93 is rotatably supported. Incidentally, the ring 95 is an 0-ring which is made of a synthetic resin or synthetic rubber and which is fitted in a groove 96 formed in the outer circumference of the center spindle 5. Moreover, that lever 93 has its lower portion extending through the sleeve 92 and loosely fitted in the rectangular hole 97 of the aforementioned actuating lever 58 until it is fitted in the small hole 98 of the detecting lever 60. At the above side of the split slit 91, on the other hand, there is slidably held through a pair of pins 99 a guide lever 100~
Incidentally, the aforementioned spindle lever 93 is formed above the groove 94 with a projection 140 which is fitted in the notch 1~1 of the sleeve 92 thereby to regulate the rota-tional position of the center spindle 5. Here, the aforementioned 0-ring 95 functions as a click mechanism for the press-fit of the sleeve 92. In this instance, inci dentally, the center spindle 5 is made detachable so that the record player can be used as a usual record player by removing the center spindle 5 and by replacing it by an ordinary small spindle (not shown).
Now, the control circuit o~ the record player having the construction thus far described will be described in the following with reference to Fig. 4. The repeat switch 13, the cam switch 86, the record presence or absence detecting microswitch 63 and the arm switch 22 thus far described are respectively connected with a main line 101. As a result, those electric parts are fed with a power supply at a constant voltage from the input terminal 102 of the main line 101.
The start/stop switch 10 has its paired contacts connected wi.th the common contact of the speed selecting switch 12 and one contact of the cam switch 86, respectively. On the other hand, the coil of the motor 88 has its one terminal connected with the main line 101 and its other terminal connected through a transistor 103 with an earth line 104. The transistor 103 is so connected that it.may be controlled by transistors 105 and 106. On the other hand, the aforementioned speed selecting switch 12 is so connected that is may control the short-circuiting of the two othe~ side lines of the coil of the aforementioned motor 88.
The aforementioned three-position plunger 44 is controlled through both a transistor 108l which in turn is controlled by the output of a logic circuit 107, and the size selecting switch 11. That logic circuit 107 is constructed of two NAND gates lO9 and 110, four NOR oates 111, 112, 113 and 114, and a flip-flop 115. This flip-flop 115 has its output terminal connected with the base of the transistor 108. On the other hand, the aforementio}led plunger 82 is connected ~ith the collector of the transistor 106.
Now, the operations of the record player having~the construction thus far described will be described in the order of the operations shown in the flow chart of Fig. 5.
First of all, if the start/stop switch 10 at the front panel is pushed and operated under the rest condition of the record player, as shown in Fig. 1, the paired contacts of the switch 10, as shown in Fig. 4, are rendered conductive so that the electric power is fed from the main line 101 through the cam switch 86 and the start/stop switch 10 to the base of the transistor 105 thereby to render this transistor 105 conductive. Then, the transistors 106 and 103 are also rendered conductive so that the motor 88 is started to rotate by the switching operation of the transistor 103. On the other hand, since the transistor 106 is conductive, the electric power is fed from a main line 116 to the plunyer 82 so that this plun~er 82 is energized. After that, incidentally, the microswitch 86 is interchanged in accordance with the later-described rotations of the drive gear 65 thereby to disconnect the main line 101 and the base of the transistor 105. Before the switch 86 is switched, a condenser 117 is charged so that the plunger 82 is maintained under its eneryized condition for the time period corresponding to such a time constant as is determined by a time constant circuit composed of that condenser 117 and a resistor 118.
When the plunger 82 is energized, the projection 81 is pushed, as shown in Fig. 7, so that the plunger 80 is swlmg counter-clockwise about the pivot pin 78 thereby to push the pin 79. Then, the trigger lever 76 is swung counter-clockwise about the pin 78 so that its projection 77 pushed the pro~ection 75 of the actuating lever 72. As a result, the lever ~72 is swung about the pin 71 so that the pin 73 in turn swings the start lever 70 counter-clockwise, as shown in Fig. 7, about the pin 71 through the opening 74. At this time, the pinion 68 has already been rotationally driven through the belt 90 and the turntable 3 by the motor 88. As a result, the pawl 69, which is formed on the pinion 68, pushes the leading end of the start lever 70. Since this lever 70 is supported by the drive gear 65, the drive gear 65 starts its rotations. Ihen, the notched portion 67 of this gear 65 is displaced from the position, where it ~aces the pinion 68, to invite an engagement between the pinion 68 and the gear 65 so that the rotating force is transmitted from the pinion 68 to the drive gear 65.
When the drive gear 65 starts its rotations, the main lever 28, which engages with the cam groove 83 of that gear 65 through the pin 84, starts to swing counter-clockwise, as viewed in Fig. 8, about the pivot 29. Then, the tab 85 of that lever 28 leaves the microswitch 86 so that this switch 86 is turned. As a result, a control voltage is then fed directly to the base of the transistor 103 from the main line 101 through the switch 86 so that the motor 88 continues its rotations (as shown in Fiy. 4). In accordance with the swinging motions of that lever 28, moreover, the pin 87 pushes the actuating lever 24, as shown in Fig. 8, so that the brake lever 23 is swung counter-clockwise about the pin 25 thereby force a brake pad 119 into contact with the brake lever 16. Thus, the swinging operation of the tone arm 6 is smoothly performed.
In accordance with the aforementioned swinging motlons of the main lever 28, moreover, the cam portion 36 of the cam plate 35 mounted on that lever 28 pushes up and swings the lifter lever 37 about the pin 38 as shown in Fig. 9. As a result, the arm lifter 15 pushes up the tone arm 6 so that this tone arm 6 performs its arm-up motion to leave the arm rest 9.
While the drive gear 65 rotates 180 degrees in the counter-clockwise direction from its start position, the main 4~
lever 28 is swung counter-clockwise. And, this swinging direction is the same as that, in which the tone arm 6 is returned. At this time, the tone arm 6 has already be in its rest position so that no motion apparently takes place thereby to effect the idle motion. In accordance with the swinging motions of the main lever 28, still moreover, Lt carries the actuating lever 30 to push the pin 120 of the lead-in lever 17. Since, however, the tone arm 6 cannot be swung any more in the counter-clockwise direction by a not-shown stopper mechanism, a high load is exerted upon the actu-ating lever 30 so that this lever 30 is reversed, as shown in Fig. 10. SpeciEically, Fig. 10 shows the toyyle mechanism for performiny that reversing operati,on. When the actuating lever 30 abuts against the pin 120, it is swung, as indicated in broken lines in the same Figure, against the action of the roller 121 of the reverse lever 32 so that the roller 121 is relatively moved from a center recess 122 to a recess 123 at one side by the pushing force of the compression coil spring 34. Incidentally, the lever 30 is formed with another recess 124 at the other side. When the main lever 28 is further swung, the actuating lever 30 on that main lever 28 abuts against a reset plate 125 so that the actuating lever 30 is reset in the original position indicated at solid lines in Fig. 10. Thus, preparation is made for the subsequent lead-in operation. Incidentally, the reset of the lever 30, which has been reversed to a position indicated at dotted lines, is performed by a pin 142 which is anchored at the supporting plate 21.
In accordance with the aforementioned forward swinging motion of the main lever 28, the projection 126 thereof leaves the projection 127 of the size cam 40 so that this cam 40 is set free for its swinging motions. I~ accordance with the aforementioned rotations of the drive gear 65, the small cam 56 of the cam plate 55 is rotated together to push the pin 54 of the feedback lever 52. As a result, the size cam 40 once rotates through the rod 50 clockwise, as viewed in Fig. 11, about the pivot pin 39. After that, when the pin 54 slides over the plateau of the cam 56/ the reedback lever 52 is swung counter-clockwise about the pin 53 so that the size cam 40 is swung through the li~k 50 counter-clockwise about the pivot pin 39. As a result, the size cam 40 is set under the condition in which its wall portion 46 or 48 is in abutment engagement with the operating element 45 of the three-position plunger 44.
The operations of this three-position plunger 44 are performed in the circuit shown in Fig. 4 such that the main lever 28 is swung to turn the switch 86. When this switch 86 is turned, the electric power is fed from the main line 101 through that switch 86 to the base of the transistor 108 so ~0 that this transistor 108 is rendered conductive. I'hen, the electric power is fed through the transistor 108 and the switch 11 to the three-position plunger 44 so that this plunger 44 is rotated clockwise or counter-clockwise in accordance with the operated position of the switch 11.
In accordance with the aforementioned rotations of the drive gear 65, the second larger cam portion 57 of the cam plate 55 is rotated. Then, this cam portion 57 pushes the pin 59 to swing the actuating lever 58 counter-clockwise, as viewed in Fig. 12. At this time, however, the detecting lever 60, which is conntedted to the actuating lever 58 through the ?~
spring 64 and which has its small hole 98 engaaing with the lower end of the spindle lever 93, is restricted by this spindle lever 93, which has its upper end abutting against the wall of the center hole 129 of the lowermost record 130 S placed on the center spindle 5, so that it is not rotated in the direction indicated at dotted lines in Fig. 6. As a result, neither the detecting lever 60 swings counter clockwise about the pin 61, as indicated at dotted lines in Fig. 12, nor its projection 62 pushes the microswitch 63. Thus, it is detected that the record 130 is present. At this time, more specifically, the detecting lever 60 is not swung, but the spring 64 is allowed to extend so that only the actuating lever 58 is swung.
When the pin 59 of the actuating lever 58 slides over the plateau of the cam portion 57, then the lever 58 is swung clockwise about the pin 61 by the action of a compression coil spring 128. Then, the pin 58a of that lever 58 pushes the side of the detecting lever 60 to thereby swing the same clockwise. At this time, more specifically, the two levers 58 and 60 are swung toaether clockwise, as;indicated at broken lines in Fig. 12. Then, the spindle lever 93, which has its lower end engaging with the small hole 98 of the detecting lever 60, is swung clockwise, as indicated at broken lines in Fig. 6, about the ring 950 As a result, the upper end portion of th~t lever 9S pushes the inner circumference of the center hole 129 of the record 130 thereby to r~ove the record 130 rightwardly, as viewed in Fig. 6. As a result, that record 130 is released from its engagement with the edge 131 of the center spindle S so that it drops along the center spindle S until it is placed upon the turntable 3.
This operations thus far described are performed timingwise during the front half rotation of the drive gear 65. Since, however, this aear 65 is formed with only one toothless or notched portion 67, it suc~edingly performs its half rotation. In this meanwhile, the lead-in operation of the tone arm 6 is accomplished. By the rear h~f rotation of the drive gear 65, more specifically, the main lever 28, which engages with the cam groove 83 of that gear 65 through the pin 84, is swung clockwise about the pivot pin 29 from the position, as indicated at solid lines in Fig. 8,;to the position as indicated at dotted lines. Then, the actuating lever 30, which is supported on that lever 28, pushes the pin 120 thereby to swing the lead-in lever 17 clockwise, as viewed in Fig. 8, about the swing shaft 7. Since this swinging motion of the lever 17 is transmitted to ~e brake lever 16 through a pro-jection 132 formed on the brake lever 16 and since the brake lever 16 itself is fixed to the swing shaft 7 of the tone arm 6, the tone arm 6 is swung clockwise abo~t the swing shaft 7, thus effecting the lead-in operations.
When the st~lus carried on the cartridge 8 at the leading end of the tone arm 6 is brought to the position corresponding to the groove at the circumferentially outermost position of the record 130 by the swinging motion of the tone arm 6, the arm 43 of the lead-in lever 17 abuts against the stepped portion 41 or 42 of the size cam 40, which has been swung to a predetermined position by the rotary plunger 44, as shown in Fi~. 11, so that the lead-in lever 17/cannot be swung any more until it is stopped. In accordance with this, the tone arm 6 also stops its swinging motion. Incidentally, which stepped portion 4~ or 42 of the size cam 40 the arm 43 is brou~t into abutment engagement with is determined in dependence upon which direction the rotary plunger 44 is rotated in on the basis of the selecting operation of the size selecting switch 11.
~en the tone arm 6 has its lead-in position regu-lated by the size cam 40 so that it cannot be swung any more until it is stopped, the actuating lever 30 receives a large load so that it is reversed, as indicated at dotted lines in Fig. 10. As a result, only the main lever 28 subsequently continues its swinging motion. By this swinging motion of the main lever 28, the cam portion 36 of the cam plate 35 on the lever 28 is made to have its condition changed from that indicated at dotted lines in Fig. 9 to that indicated at solid lines so that the tone arm 6 is lowered. As a result, the stylus carried on the cartridge 8 at the leading end of the tone arm 6 is brought i~to contact with the record 130 placed upon the turntable 3. Thus, the record playing operation is started. When the drive gear 65 is rotated one turn so that the main lever 28 is returned to its initial position shown in Fig. 3, its tab 85 pushes the switch 86.
Under this particular condition, the drive gear 65 stops its rotation by the action of its notched portion 67. As a result that the switch 86 is pushed, the output of the switch 86 resets the flip-flop 115 through the NOR gate 114 to thereby render the transistor 10~ inconductive. As a result, the rotary plunger 44 is returned to its neutral position. Hence the main lever 28 is returned to the position shown in Fig. 3, moreover, the projection 126 of the lever 28 pushes the pro-jection 127 to return the size cam 40. As a result, the tone arm 6 is never prevented from being swung by the size cam 40 while the record is being played.
Thus, the record 130 d~opped onto the turntable 3 is reproduced and played in that way. In this meanwhile, the tone arm 6 is gradually guided to the center of the record 130 by the spiral groove while it is being swung.
Moreover, when the stylus of the cartridge 8 comes to the groove closest to the center of the record 130, the projection 133 of the lead-in lever 17 pushes the tab 134 of the tri~ger lever 76, as shown in Fig. 13, in accordance with the swinging motion of the tone arm 6. Then, similarly to the case, ir.
which the aforementioned plunger 82 is energized, the pinion 68 and the drive gear 65 are brought into engagement with each other by the actuating lever 72 and the start lever 70 so that the drive gear 65 starts again its rotations. During the front half rotation of the drive gear 65, the main lever 28 is swung counter-clockwise, as shown in Fig. 8, about the pin 29 so that it is subjected to the arm-up operation by the cam portion 36 of that lever 28. At this time, moreover, since the tone arm 6 is in its for~ard swinging position, the actuating lever 30 on that lever 28 pushes the pin 120 to thereby return the tone arm 6 through the lead-in lever 17.
Moreover, whether or not the record 130 is still present on the center spindle 5 is detected in synchronism ~ith the first step of the returning operation of the tone arm 6. This detection is the same as the aforementioned first detecting operation and is performed by the actuating lever 58 and the detecting lever 60 through the cam portion 57 of the cam plate 55 which is made rotatable with the drive gear 65. Uniess the microswitch 63 ls pushed by the projection 62 of the detecting lever 60, it is detected that the record 130 is still present. And, after the tone arm 6 has been completely returned by the actuating lever 30, the detecting lever 60 is swung backwardly, as shown in Fig. 6, so that the subsequent record 130 drops from the spindle 5 onto the turn table 3.
When the tone arm 6 is completely returned, the actuating lever 30 on the aforementioned main lever 28 is subjected to a large load so that it is reversed, as shown in Fig. 10. Moreover, when the main lever 28 is swung, it abuts against the reset plate 125 so that it is reset. On the other hand, if the main lever 28 is swung backward during the sub-se~uent rear half rotation of the drive gear 65, then the actuating lever 30 pushes the lead-in lever 17 through the pin 120 to lead in the tone arm 6. Then, the tone arm 6 is lowered by the cam portion 36 on the main lever 28 so that the record 130 which has newly dropped onto the turntable 3 is played. So long as the records 130 are present on the center spindle 5, they are consecutively made to drop and played.
After the playing operation of the aforementioned Eirst record 130 has been finished, it is to be detected whether or not any record 130 is still ]eft on the center spindle 5.
In case it is detected that there is no record 130 left, the aforementioned detecting lever 60 is swung together with the actuating lever 58 counter-clockwise, as viewd in Fig. 12, so that its projection 62 pushes the switch 63. Thus, it is detected that there is no record 130 left on the center spindle 5. Then, as a result that the switch 63 is turned off, as shown in Fig. 4, the input to one NO~ gate 112 is changed from a level "1" to a level "O" so that the flip-flop 115 is inverted to render the transistor 108 inconductive. Then, the power supply to the three-position plunger 44 i5 interrupted so that is operating element 45 is returned to its neutral posi-tion. Accordinaly, the size cam 40 is set at the position shown at solid lines in Fig. 11, so that the leading end of an arm 135, which is formed on the size cam 40~ as shown in Fig. 14, is shifted to the position where it abuts against the prot-rusion 136 of the size resetlever 18. Even if the main lever 28 is swung backward under that condition, the actuating lever 30 first abuts against the pin 136 of the size reset lever 18 so that it is subjected to a large load until it is reversed.
In this case, more specifically, the main lever 28 does not lead in the tone arm 6 through the lead-in lever 17, but the tone arm 6 resides in its arm rest position. Moreover, since the tone arm 6 is held on the arm rest 9, the microswitch 22 is turned off. And, when the drive gear 65 is rotated one turn, the cam switch 86 is turned off so that the transistor 103 is rendered inconductive. As a result, the motor 88 stops its rotations so that the record player as a whole is brought into its stop condition.
On the other hand, in case the repeat switch 13 is pushed even if it is detected that there is no record 130 present on the center spindle 5, one input terminal of the NAND gate 110 shown in Fig. 4 is at the level "O". As a result, ~ven if the switch 63 is turned on, the flip-flop 115 is not inverted so that the transistor 108 is left under its conductive condition. As a result, the three-position plunger 44 is continuously fed with the electric power from the power source so that the size cam 40 is held in the posi-tion indicated at dotted lines or at solid lines in Fig. 11.
In this case, consequently, the tone arm 6 is led in so that the record 130 on the turntable is played again. In other words, the repeating operation is performed. This operation is continued many times so long as the start/stop switch 10 is not operated from the outside. It should be noted here that the repeating operation is performed only in case there is no record 130 left on the center spindle 5.
In the record player thus far described, moreover, the record playing operation is not performed in case the tone arm is not at its rest position when the start/stop switch 10 is pushed to effect the automatic playing operation.
More specifically, since -the arm switch 22 is not turned off yet even when the start/stop switch 10 is turned on, the output of the switch 22 is fed to the NAND gate 109 so that the flip-flop 115 is inverted. As a result, the transistor 108 is rendered inconductive so that no electric power is fed to the three-position plunger 44. As a result, similarly to the case in which there is none of the aforementioned records 130 and in which the repeat switch 13 is not pushed, the size reset lever 18 is mechanically locked by the size cam 40 so that the tone arm 6 is not led in. In this case, specifically, the start/stop switch 10 is pushed to rotate the drive gear 65 so that the tone arm 6 is held at its arm rest position as it is after it has been returned.
In the record player thus far described, if the start/
~top switch 10 is pushed during the record playing operation, this operation is also ended. More specifically, if the start/
stop switch 10 is pushed during the record playing operation, this switcil 10 generates a stop signal, which is dominant over all other signals to effect the stop condition. This operation is similar to that in case the tone arm 6 is not at its rest position when in the aforementioned starting operation, so that the plunger 82 is energized, when the start/stop switch 10 is turned on, to thereby effect one rotation of the drive gear 65. At this time, however, since the record is being played, the arm switch 22 is turned on so that the electric power is not fed to the three-position plunger 44. As a result, when nothing but the automatic returning operation is performed so that the tone arm 6 is swung to its rest position, the tone arm 6 is held in its rest position, as shown in Fig. 14, by the actions of the size cam 40 and the size reset lever 18 after it has been returned. In other words, in this case, the rear half rotation of the drive gear 65 is idle so that the record player is brought into its stop condition. It should, therefore, be noted here that the switch 10 selectively acts as a start switch and as a stop switch.
Moreover, even if any record 130 is left on the center spindle 5 when in the stopping operation, it never drops onto the turntable 3. In other words, since the three-position plunger 44 is deenergized, the size cam 40 is held in the position shown in Fig. 14. This position of the size cam 40 is fed back through the rod 50 to the feedbacklever 52 so that the leading end portion 138 of that lever 52 takes a position where it faces the projection 139 of the actuating lever 58. As a result, neither this actuating lever 58 can swing any more clockwise, as viewed in Fig. 14, about the pin 61, nor the detecting lever 60 swings in the same direction so that the dropping operation of the record 130 is not caused any more. The prohibition of that dropping operation is always performed in the case of the operations, in which the size cam 40 takes the position shown in Fig. 14 thereby to block the tone arm 6 from being led in.
As a result, none of the records 130 drop unless the record playing operation is performed.
In the record player thus far described, moreover, the tone arm 6 can be manually operated to play the records without any provision of the change-over switch between the automatic and manual operations. More specifically, when the tone arm 6 is led in by the manual operation, the lead-in lever 17 is swung to turn on the switch 22 shown in Fig. 4 so that the motor 38 is driven through the transistor 103.
As a result, the record playing operation is started. More-over, since the changed positions of the switch 22 and the cam switch 86 at that time are under the same condition as the case of the automatic operation and since the mechanisms are similar to those in the case of the automatic operation, this automatic operation is thereafter continued to effect the automatic changin~ operation or the automatic repeating operation.
If the tone arm 6 is returned to its arm rest position by the manual operation during the automatic playing operation, the stop condition is automatically invited. More specifi-cally, if the tone arm 6 is manually returned, the lead-in lever 17 is returned together so that its projection 20 pushes the arm switch 22. Then, this switch 22 is turned off so that the transistor 103 is also rendered inconductive. As a result, the motor 88 is stopped so that the turntable 3 LS accordingly stopped.
Having described specific ambodiments of the present invention with reference to the accompanying drawings, it is to be understood that the invention is not limited to those precise embodiment, and that various chan~es and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined ln the appended claims.
Field of the Invention:
The present invention relates to a record ch~nger, and more particularly to a record changer of the type, in which a record is held on a center spindle and is made to drop onto a turntable so that it may be played.
Description of the Prior Art:
One sort of a conventional record changer with a center spindle is disclosed in U.S. Patent ~o.3,489,41~ (allowed to H.J. Fortune et al.). ~he center spindle of the changer serves for supporting and dropping records in sequence with a mechanism within the center support for sensing the pre-sence or absence of a record for controlling an automatic shut-off mechanism. With the center support for dropping and sensing the records, there is also provided an edge support for the sole purpose of balancing the records. The tone arm is also balanced by a counterweight which is resiliently supported from the tone arm in all directions of relative movement between the tone arm and the counterweight.
However/ the conventional changer disclosed is purely mechanically arranged. In the mechanical arrangement, there are provided a start button and a stop button, the former of which is pushed when it is intended to play the record and the latter of which is pushed when it is intended to stop the record playing operation. With this construction, however, it is not preferred that the number of the ope-rating buttons i.5 increased and that the operabili-ty is deteriorated.
In this record changer, still moreover, the returning mechanism of the tone arm and the dropping mechanism of the records are so interlocked that the record always drops when the tone arm is automatically returned. This results in that the record drops, too, even in case the auto-returning operation is performed in response to the stop command. In order to ensure safety, moreover, the lead-in operation is performed upon the subsequent start after at least the drive mechanism effects the auto-returning operation. As a result, there arises a problem that the record which has dropped in response to the drop command fails to be played. In order to solve this problem, there is conceivable a method, in which the returning operation is performed in a manual manner after the function has been set at a non-automatic mode and after the power supply circuit has been broken. However, this method is not preferred because it is inferior in operability.
Furthermore, in order to perform the manual ope-ration as well as the automatic changing operation in the record changer having the construction thus far described, there are provided an operating button for selecting the automatic and manual modes so that the automatic operation can be effected, when it is shifted to the automatic mode, whereas the manual operation can be effected when it is shifted to the manual mode. In other words, the automatic and manual operations belong to absolutely independent operating systems so that they cannot be interchanged. As a result, the operability is inferior, and the number of the operating buttons is not a few.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an improved record changer which is excellent in its operability.
Another object of the present invention is to provide a record changer which has a reduced number o ope-rating buttons but can perform complicated operations.
A further object of the present invention is to provide a record changer with sinyle operating means which can function as both drive means and stop means.
A still further object of the present invention is to provide a record changer wherein records are prevented from dropping down from a center spindle when a tone arm is returned upon the stopping operation.
A still further object of the present invention is to provide a record changer which can be manually operated and in which the manual operation can be ccntinuously shifted to the automatic operation.
In accordance with one aspect of the present invention, there is provided a record changer of the type, in which records are held on a center spindle and are made to drop onto a turntable so that they are played, which changer includes:
a tone arm for reproducing the signals recorded in the records;
detecting means for detecting the position of the tone arm;
and operating means for controlling the drive and stop of the record changer; which changer is characterized in that it is driven, when the operatina means is operated while it is being detected by the detecting means that the arm is in its inoperative position, and is stopped when the operating means is operated while it is being detected by said detecting means that the arm is in its operative position.
The above, and other objects, features and advan-tages of the invention will be apparent from the following detailed description of an illustrative embodiment which is to be read in connections with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view of a record player with an automatic record changer according to one embodiment S of the present invention;
Fig. 2 is an exploded perspective view of the inside mechanism of the record player;
Fig. 3 is a top plan view of the same;
Fig. 4 is a circuit diagram of the control circuit of the record player;
Fig. 5 is a flow chart showing the operations of the record player;
Fig. 6 is a sectional view of an essential portion of a center spindle showing the operations of the center spindle;
Fig. 7 is a top plan view of an essential portion of a trigger mechanism showing the starting operation;
Fig. 8 is a top plan view of a main lever assembly showing the swinging operation of the main lever;
Fig. 9 is an elevational view of an arm lifter showing the lifting and lowering operations of a tone arm;
Fig. 10 is a top plan view of an actuating lever assembly showing the toggle operation of the actuating lever for the lead-in and automatic returning operations;
Fig. 11 is a top plan view of a record size selecting mechanism showing the setti~g operation of a size cam;
Fig. 12 is a top plan view of a record detecting assembly showing the operation for detecting the presence or absence of a record;
Fig. 13 is a top plan view of a record end detecting i?~$i~
mechanism showing the record end detecting operation and the returning operation; and Fig. 14 is a t2 plan view of the main lever assembly showing the holding operation of a size select lever by the size cam.
DESCRIPTION OF TI~E PREFERRED EMsoDIMENT
. . ~
Referring now to Fig. 1, a record player with an automatic record changer embodying the present invention has a top panel 1 which is formed with a large circular opening 2.
In this opening 2, there is arranged a turntable 3 which is fitted in a center shaft 4 such that the former frictional~y engages with the latter. A center spindle 5 is detachably mounted in the centex shaft 4. At the side of the turntable 3 and above the panel 1, there is arranged a tone arm 6 which is adapted to be swlmg by a swing shaft 7. A cartridge 8 is attached to the leading end of the tone arm 6. This tone arm 6 in turn is supported on an arm rest 9 when in a rest position.
On ~he other hand, a front panel of the record player is equipped with a start/stop switch 10. There are arranged in a row on the aforementioned panel 1, a size selecting switch 11, a speed selecting switch 12 and a repeat switch 13. On the panel 1, moreover, there is arranged an operating lever 14 so that an arm lifter 15 can be manually operated.
The inside mechanism of the record player will now be described with reference to Figs. 2 and 3. A brake plate 16 is fixed to the swing shaft 7 of the aforementioned tone arm 6. A lead-in lever 17 and a size reset lever 18 are rotatabiy mounted on the swing shaft 7 in a manner to overlap the brake plate 16. The lead-in lever 17 is connected to the brake plate 16 by means of a coil spring 19. On the other hand, the lead-in lever 17 is integrally provided with a projection 20, which is made oper~tive to push an arm switch 22 fixedly held on a supporting plate 21. At the side of the afore-mentioned brake plate 16, on the other hand, there arearranged a brake lever 23 and an actuating lever 24, both of which are ~otatably supported by a common pivot pin 25.
Moreover, a coil spring 26 is attached to one end of the actuating lever 24, and a compression coil spring 27 is interposed between the hrake lever 23 and the actuating lever 24.
Below the turntable 3, there is arranged a main lever 28 which is rotatably supported by means of a pivot pin 29.
And, an actuating lever 30 is held through a pin 31 on the leading end ~f that lever 28. Moreover, the actuating lever 30 is being reversable by a reverse lever 32 to thereby effect the toggle motions. The reverse lever 32 is supported on the main lever 28 through a pin 33 and is pushed b~ a compression coil spring 34. To the upper side of the main lever 28, on the other hand, there is attached a cam plate 35 of a synthetic resin, which has its cam portion 36 abutting against the side portion of a lifter lever 37. This lifter lever 37 has its leg portion rotatably supported by a pin 38 and its leading end portion abutting against the lower end of the support shaft of the aforementioned arm lifter 15.
At the side of the main lever 28, there is arranged a size cam 40 which is rotatably supported by means oE pivot pin 39. The size cam 40 has its one side formed with two stepped portions 41 and 42, which are adapted to abut against the arm portion 43 of the aforementioned lead-in lever 17 to thereby effect the size selection. That size cam 40 is further formed with three wall portions 46, 47 and 48 which are adapted to abut against the operating element 45 of a rotary plunger 44 having three positions. The size cam 40 thus constructed is connected through a pin 49 to one end of a rod 50, the other end of which is connected through a pin 51 to a feedback lever 52. The feedback lever 52 is rotatably supported by means of a pin 53 and has on its leading end a pin 54 adapted to abut against a first small cam portion 56 which is formed on the lower side of a cam plate 55. This cam plate 55 is formed on its outer peripheral portion with a second cam portion 57 which is adapted to abut against the leading end pin 59 of an actuating lever 58.
By a pin 61 supporting the acutating lever 58, there is also rotatably supported a detecting lever 60, which is formed integrally with such a pro~ection 62 as is adapted to push a switch 63 for detecting the presence or absence of a record. On the other hand, the detecting lever 60 and the aforementioned actuating lever 55 are connected by means of a coil spring 64.
Above the aforementioned cam plate 55, there is arranged in an overlapping manner a drive gear 65, both of which are fixed to a common pivot pin 66. The portion of the drive gear 65, which is toothed in its outer circumference, is further formed with a toothless or notched portion 67.
And, the drive gear 65 thus formed is so constructed that it can engage with a pinion 6~ which is fixed to the aforementioned center shaft 4. On the other hand, this center shaft 4 is integraily formed on its outer circumference with a pawl 69, which is adapted to abut against the leading end of a start *~
lever 70 which is supported through a pin 71 on the upper end surface of the drive gear 65. Below the start lever 70, there is arranged an actuating lever 72 such that they are supported on the drive gear 65 by means of l:he cornmon pin 71.
5 The actuating lever 72 has a pin 73 which is inserted in-to an opening 74 formed in the start lever 70. The actuating lever 72 is integrally formed with a downward projection 75 which is positioned to face a land 77 formed at the leading end of a trigger lever 76. This trigger lever 76 is rotatably supported on a pin 78/ and a pin 79 mounted on the lever 76 is adapted to be pushed by a plunger lever 80. The plunger lever 80 has its leading end formed with a projection 81 which constructs the rod of a plunger 82.
The aforementioned drive gear 65 has its lower end face formed with a cam groove 83 which is adapted to engage with a pin 84 anchored at the leading end of the aforementioned main lever 28. Moreover, this main lever 28 has its leading end formed with a tab 85 which is adapted to push a microswitch 86. Moreover, a pin 87, which is anchored at that main lever ~0 28, is adapted to push the end portion of the.aforementioned actuating lever ~4. At the side of the drive gear 65, on the other hand, there is arranged a motor 88, by which the afore-mentioned turntable 3 is rotationally driven through such a belt 90 as is made to run on the pulley 89 of that motor 88.
The center spindle 5 which is attached to the afore-mentioned center shaft 4 will be described in the following.
The spindle 5 is molded of a synthetic resin such as a poly-phenylene sulfide resin and is formed with a split slit 91 all over i ts length, as shown in Fig. 6. Moreover, the center spindle 5 is made resiliently deformable in the radial direction by the action of that split 91 and is press-fitted in a sleeve 92 which is fixed to the frame of the record player through the bore of the center shaft 4. In the split slit 91, moreover, there is arranged a spindle lever 93, which is S formed with such a groove 94 as can receive a ring 95 so that the lever 93 is rotatably supported. Incidentally, the ring 95 is an 0-ring which is made of a synthetic resin or synthetic rubber and which is fitted in a groove 96 formed in the outer circumference of the center spindle 5. Moreover, that lever 93 has its lower portion extending through the sleeve 92 and loosely fitted in the rectangular hole 97 of the aforementioned actuating lever 58 until it is fitted in the small hole 98 of the detecting lever 60. At the above side of the split slit 91, on the other hand, there is slidably held through a pair of pins 99 a guide lever 100~
Incidentally, the aforementioned spindle lever 93 is formed above the groove 94 with a projection 140 which is fitted in the notch 1~1 of the sleeve 92 thereby to regulate the rota-tional position of the center spindle 5. Here, the aforementioned 0-ring 95 functions as a click mechanism for the press-fit of the sleeve 92. In this instance, inci dentally, the center spindle 5 is made detachable so that the record player can be used as a usual record player by removing the center spindle 5 and by replacing it by an ordinary small spindle (not shown).
Now, the control circuit o~ the record player having the construction thus far described will be described in the following with reference to Fig. 4. The repeat switch 13, the cam switch 86, the record presence or absence detecting microswitch 63 and the arm switch 22 thus far described are respectively connected with a main line 101. As a result, those electric parts are fed with a power supply at a constant voltage from the input terminal 102 of the main line 101.
The start/stop switch 10 has its paired contacts connected wi.th the common contact of the speed selecting switch 12 and one contact of the cam switch 86, respectively. On the other hand, the coil of the motor 88 has its one terminal connected with the main line 101 and its other terminal connected through a transistor 103 with an earth line 104. The transistor 103 is so connected that it.may be controlled by transistors 105 and 106. On the other hand, the aforementioned speed selecting switch 12 is so connected that is may control the short-circuiting of the two othe~ side lines of the coil of the aforementioned motor 88.
The aforementioned three-position plunger 44 is controlled through both a transistor 108l which in turn is controlled by the output of a logic circuit 107, and the size selecting switch 11. That logic circuit 107 is constructed of two NAND gates lO9 and 110, four NOR oates 111, 112, 113 and 114, and a flip-flop 115. This flip-flop 115 has its output terminal connected with the base of the transistor 108. On the other hand, the aforementio}led plunger 82 is connected ~ith the collector of the transistor 106.
Now, the operations of the record player having~the construction thus far described will be described in the order of the operations shown in the flow chart of Fig. 5.
First of all, if the start/stop switch 10 at the front panel is pushed and operated under the rest condition of the record player, as shown in Fig. 1, the paired contacts of the switch 10, as shown in Fig. 4, are rendered conductive so that the electric power is fed from the main line 101 through the cam switch 86 and the start/stop switch 10 to the base of the transistor 105 thereby to render this transistor 105 conductive. Then, the transistors 106 and 103 are also rendered conductive so that the motor 88 is started to rotate by the switching operation of the transistor 103. On the other hand, since the transistor 106 is conductive, the electric power is fed from a main line 116 to the plunyer 82 so that this plun~er 82 is energized. After that, incidentally, the microswitch 86 is interchanged in accordance with the later-described rotations of the drive gear 65 thereby to disconnect the main line 101 and the base of the transistor 105. Before the switch 86 is switched, a condenser 117 is charged so that the plunger 82 is maintained under its eneryized condition for the time period corresponding to such a time constant as is determined by a time constant circuit composed of that condenser 117 and a resistor 118.
When the plunger 82 is energized, the projection 81 is pushed, as shown in Fig. 7, so that the plunger 80 is swlmg counter-clockwise about the pivot pin 78 thereby to push the pin 79. Then, the trigger lever 76 is swung counter-clockwise about the pin 78 so that its projection 77 pushed the pro~ection 75 of the actuating lever 72. As a result, the lever ~72 is swung about the pin 71 so that the pin 73 in turn swings the start lever 70 counter-clockwise, as shown in Fig. 7, about the pin 71 through the opening 74. At this time, the pinion 68 has already been rotationally driven through the belt 90 and the turntable 3 by the motor 88. As a result, the pawl 69, which is formed on the pinion 68, pushes the leading end of the start lever 70. Since this lever 70 is supported by the drive gear 65, the drive gear 65 starts its rotations. Ihen, the notched portion 67 of this gear 65 is displaced from the position, where it ~aces the pinion 68, to invite an engagement between the pinion 68 and the gear 65 so that the rotating force is transmitted from the pinion 68 to the drive gear 65.
When the drive gear 65 starts its rotations, the main lever 28, which engages with the cam groove 83 of that gear 65 through the pin 84, starts to swing counter-clockwise, as viewed in Fig. 8, about the pivot 29. Then, the tab 85 of that lever 28 leaves the microswitch 86 so that this switch 86 is turned. As a result, a control voltage is then fed directly to the base of the transistor 103 from the main line 101 through the switch 86 so that the motor 88 continues its rotations (as shown in Fiy. 4). In accordance with the swinging motions of that lever 28, moreover, the pin 87 pushes the actuating lever 24, as shown in Fig. 8, so that the brake lever 23 is swung counter-clockwise about the pin 25 thereby force a brake pad 119 into contact with the brake lever 16. Thus, the swinging operation of the tone arm 6 is smoothly performed.
In accordance with the aforementioned swinging motlons of the main lever 28, moreover, the cam portion 36 of the cam plate 35 mounted on that lever 28 pushes up and swings the lifter lever 37 about the pin 38 as shown in Fig. 9. As a result, the arm lifter 15 pushes up the tone arm 6 so that this tone arm 6 performs its arm-up motion to leave the arm rest 9.
While the drive gear 65 rotates 180 degrees in the counter-clockwise direction from its start position, the main 4~
lever 28 is swung counter-clockwise. And, this swinging direction is the same as that, in which the tone arm 6 is returned. At this time, the tone arm 6 has already be in its rest position so that no motion apparently takes place thereby to effect the idle motion. In accordance with the swinging motions of the main lever 28, still moreover, Lt carries the actuating lever 30 to push the pin 120 of the lead-in lever 17. Since, however, the tone arm 6 cannot be swung any more in the counter-clockwise direction by a not-shown stopper mechanism, a high load is exerted upon the actu-ating lever 30 so that this lever 30 is reversed, as shown in Fig. 10. SpeciEically, Fig. 10 shows the toyyle mechanism for performiny that reversing operati,on. When the actuating lever 30 abuts against the pin 120, it is swung, as indicated in broken lines in the same Figure, against the action of the roller 121 of the reverse lever 32 so that the roller 121 is relatively moved from a center recess 122 to a recess 123 at one side by the pushing force of the compression coil spring 34. Incidentally, the lever 30 is formed with another recess 124 at the other side. When the main lever 28 is further swung, the actuating lever 30 on that main lever 28 abuts against a reset plate 125 so that the actuating lever 30 is reset in the original position indicated at solid lines in Fig. 10. Thus, preparation is made for the subsequent lead-in operation. Incidentally, the reset of the lever 30, which has been reversed to a position indicated at dotted lines, is performed by a pin 142 which is anchored at the supporting plate 21.
In accordance with the aforementioned forward swinging motion of the main lever 28, the projection 126 thereof leaves the projection 127 of the size cam 40 so that this cam 40 is set free for its swinging motions. I~ accordance with the aforementioned rotations of the drive gear 65, the small cam 56 of the cam plate 55 is rotated together to push the pin 54 of the feedback lever 52. As a result, the size cam 40 once rotates through the rod 50 clockwise, as viewed in Fig. 11, about the pivot pin 39. After that, when the pin 54 slides over the plateau of the cam 56/ the reedback lever 52 is swung counter-clockwise about the pin 53 so that the size cam 40 is swung through the li~k 50 counter-clockwise about the pivot pin 39. As a result, the size cam 40 is set under the condition in which its wall portion 46 or 48 is in abutment engagement with the operating element 45 of the three-position plunger 44.
The operations of this three-position plunger 44 are performed in the circuit shown in Fig. 4 such that the main lever 28 is swung to turn the switch 86. When this switch 86 is turned, the electric power is fed from the main line 101 through that switch 86 to the base of the transistor 108 so ~0 that this transistor 108 is rendered conductive. I'hen, the electric power is fed through the transistor 108 and the switch 11 to the three-position plunger 44 so that this plunger 44 is rotated clockwise or counter-clockwise in accordance with the operated position of the switch 11.
In accordance with the aforementioned rotations of the drive gear 65, the second larger cam portion 57 of the cam plate 55 is rotated. Then, this cam portion 57 pushes the pin 59 to swing the actuating lever 58 counter-clockwise, as viewed in Fig. 12. At this time, however, the detecting lever 60, which is conntedted to the actuating lever 58 through the ?~
spring 64 and which has its small hole 98 engaaing with the lower end of the spindle lever 93, is restricted by this spindle lever 93, which has its upper end abutting against the wall of the center hole 129 of the lowermost record 130 S placed on the center spindle 5, so that it is not rotated in the direction indicated at dotted lines in Fig. 6. As a result, neither the detecting lever 60 swings counter clockwise about the pin 61, as indicated at dotted lines in Fig. 12, nor its projection 62 pushes the microswitch 63. Thus, it is detected that the record 130 is present. At this time, more specifically, the detecting lever 60 is not swung, but the spring 64 is allowed to extend so that only the actuating lever 58 is swung.
When the pin 59 of the actuating lever 58 slides over the plateau of the cam portion 57, then the lever 58 is swung clockwise about the pin 61 by the action of a compression coil spring 128. Then, the pin 58a of that lever 58 pushes the side of the detecting lever 60 to thereby swing the same clockwise. At this time, more specifically, the two levers 58 and 60 are swung toaether clockwise, as;indicated at broken lines in Fig. 12. Then, the spindle lever 93, which has its lower end engaging with the small hole 98 of the detecting lever 60, is swung clockwise, as indicated at broken lines in Fig. 6, about the ring 950 As a result, the upper end portion of th~t lever 9S pushes the inner circumference of the center hole 129 of the record 130 thereby to r~ove the record 130 rightwardly, as viewed in Fig. 6. As a result, that record 130 is released from its engagement with the edge 131 of the center spindle S so that it drops along the center spindle S until it is placed upon the turntable 3.
This operations thus far described are performed timingwise during the front half rotation of the drive gear 65. Since, however, this aear 65 is formed with only one toothless or notched portion 67, it suc~edingly performs its half rotation. In this meanwhile, the lead-in operation of the tone arm 6 is accomplished. By the rear h~f rotation of the drive gear 65, more specifically, the main lever 28, which engages with the cam groove 83 of that gear 65 through the pin 84, is swung clockwise about the pivot pin 29 from the position, as indicated at solid lines in Fig. 8,;to the position as indicated at dotted lines. Then, the actuating lever 30, which is supported on that lever 28, pushes the pin 120 thereby to swing the lead-in lever 17 clockwise, as viewed in Fig. 8, about the swing shaft 7. Since this swinging motion of the lever 17 is transmitted to ~e brake lever 16 through a pro-jection 132 formed on the brake lever 16 and since the brake lever 16 itself is fixed to the swing shaft 7 of the tone arm 6, the tone arm 6 is swung clockwise abo~t the swing shaft 7, thus effecting the lead-in operations.
When the st~lus carried on the cartridge 8 at the leading end of the tone arm 6 is brought to the position corresponding to the groove at the circumferentially outermost position of the record 130 by the swinging motion of the tone arm 6, the arm 43 of the lead-in lever 17 abuts against the stepped portion 41 or 42 of the size cam 40, which has been swung to a predetermined position by the rotary plunger 44, as shown in Fi~. 11, so that the lead-in lever 17/cannot be swung any more until it is stopped. In accordance with this, the tone arm 6 also stops its swinging motion. Incidentally, which stepped portion 4~ or 42 of the size cam 40 the arm 43 is brou~t into abutment engagement with is determined in dependence upon which direction the rotary plunger 44 is rotated in on the basis of the selecting operation of the size selecting switch 11.
~en the tone arm 6 has its lead-in position regu-lated by the size cam 40 so that it cannot be swung any more until it is stopped, the actuating lever 30 receives a large load so that it is reversed, as indicated at dotted lines in Fig. 10. As a result, only the main lever 28 subsequently continues its swinging motion. By this swinging motion of the main lever 28, the cam portion 36 of the cam plate 35 on the lever 28 is made to have its condition changed from that indicated at dotted lines in Fig. 9 to that indicated at solid lines so that the tone arm 6 is lowered. As a result, the stylus carried on the cartridge 8 at the leading end of the tone arm 6 is brought i~to contact with the record 130 placed upon the turntable 3. Thus, the record playing operation is started. When the drive gear 65 is rotated one turn so that the main lever 28 is returned to its initial position shown in Fig. 3, its tab 85 pushes the switch 86.
Under this particular condition, the drive gear 65 stops its rotation by the action of its notched portion 67. As a result that the switch 86 is pushed, the output of the switch 86 resets the flip-flop 115 through the NOR gate 114 to thereby render the transistor 10~ inconductive. As a result, the rotary plunger 44 is returned to its neutral position. Hence the main lever 28 is returned to the position shown in Fig. 3, moreover, the projection 126 of the lever 28 pushes the pro-jection 127 to return the size cam 40. As a result, the tone arm 6 is never prevented from being swung by the size cam 40 while the record is being played.
Thus, the record 130 d~opped onto the turntable 3 is reproduced and played in that way. In this meanwhile, the tone arm 6 is gradually guided to the center of the record 130 by the spiral groove while it is being swung.
Moreover, when the stylus of the cartridge 8 comes to the groove closest to the center of the record 130, the projection 133 of the lead-in lever 17 pushes the tab 134 of the tri~ger lever 76, as shown in Fig. 13, in accordance with the swinging motion of the tone arm 6. Then, similarly to the case, ir.
which the aforementioned plunger 82 is energized, the pinion 68 and the drive gear 65 are brought into engagement with each other by the actuating lever 72 and the start lever 70 so that the drive gear 65 starts again its rotations. During the front half rotation of the drive gear 65, the main lever 28 is swung counter-clockwise, as shown in Fig. 8, about the pin 29 so that it is subjected to the arm-up operation by the cam portion 36 of that lever 28. At this time, moreover, since the tone arm 6 is in its for~ard swinging position, the actuating lever 30 on that lever 28 pushes the pin 120 to thereby return the tone arm 6 through the lead-in lever 17.
Moreover, whether or not the record 130 is still present on the center spindle 5 is detected in synchronism ~ith the first step of the returning operation of the tone arm 6. This detection is the same as the aforementioned first detecting operation and is performed by the actuating lever 58 and the detecting lever 60 through the cam portion 57 of the cam plate 55 which is made rotatable with the drive gear 65. Uniess the microswitch 63 ls pushed by the projection 62 of the detecting lever 60, it is detected that the record 130 is still present. And, after the tone arm 6 has been completely returned by the actuating lever 30, the detecting lever 60 is swung backwardly, as shown in Fig. 6, so that the subsequent record 130 drops from the spindle 5 onto the turn table 3.
When the tone arm 6 is completely returned, the actuating lever 30 on the aforementioned main lever 28 is subjected to a large load so that it is reversed, as shown in Fig. 10. Moreover, when the main lever 28 is swung, it abuts against the reset plate 125 so that it is reset. On the other hand, if the main lever 28 is swung backward during the sub-se~uent rear half rotation of the drive gear 65, then the actuating lever 30 pushes the lead-in lever 17 through the pin 120 to lead in the tone arm 6. Then, the tone arm 6 is lowered by the cam portion 36 on the main lever 28 so that the record 130 which has newly dropped onto the turntable 3 is played. So long as the records 130 are present on the center spindle 5, they are consecutively made to drop and played.
After the playing operation of the aforementioned Eirst record 130 has been finished, it is to be detected whether or not any record 130 is still ]eft on the center spindle 5.
In case it is detected that there is no record 130 left, the aforementioned detecting lever 60 is swung together with the actuating lever 58 counter-clockwise, as viewd in Fig. 12, so that its projection 62 pushes the switch 63. Thus, it is detected that there is no record 130 left on the center spindle 5. Then, as a result that the switch 63 is turned off, as shown in Fig. 4, the input to one NO~ gate 112 is changed from a level "1" to a level "O" so that the flip-flop 115 is inverted to render the transistor 108 inconductive. Then, the power supply to the three-position plunger 44 i5 interrupted so that is operating element 45 is returned to its neutral posi-tion. Accordinaly, the size cam 40 is set at the position shown at solid lines in Fig. 11, so that the leading end of an arm 135, which is formed on the size cam 40~ as shown in Fig. 14, is shifted to the position where it abuts against the prot-rusion 136 of the size resetlever 18. Even if the main lever 28 is swung backward under that condition, the actuating lever 30 first abuts against the pin 136 of the size reset lever 18 so that it is subjected to a large load until it is reversed.
In this case, more specifically, the main lever 28 does not lead in the tone arm 6 through the lead-in lever 17, but the tone arm 6 resides in its arm rest position. Moreover, since the tone arm 6 is held on the arm rest 9, the microswitch 22 is turned off. And, when the drive gear 65 is rotated one turn, the cam switch 86 is turned off so that the transistor 103 is rendered inconductive. As a result, the motor 88 stops its rotations so that the record player as a whole is brought into its stop condition.
On the other hand, in case the repeat switch 13 is pushed even if it is detected that there is no record 130 present on the center spindle 5, one input terminal of the NAND gate 110 shown in Fig. 4 is at the level "O". As a result, ~ven if the switch 63 is turned on, the flip-flop 115 is not inverted so that the transistor 108 is left under its conductive condition. As a result, the three-position plunger 44 is continuously fed with the electric power from the power source so that the size cam 40 is held in the posi-tion indicated at dotted lines or at solid lines in Fig. 11.
In this case, consequently, the tone arm 6 is led in so that the record 130 on the turntable is played again. In other words, the repeating operation is performed. This operation is continued many times so long as the start/stop switch 10 is not operated from the outside. It should be noted here that the repeating operation is performed only in case there is no record 130 left on the center spindle 5.
In the record player thus far described, moreover, the record playing operation is not performed in case the tone arm is not at its rest position when the start/stop switch 10 is pushed to effect the automatic playing operation.
More specifically, since -the arm switch 22 is not turned off yet even when the start/stop switch 10 is turned on, the output of the switch 22 is fed to the NAND gate 109 so that the flip-flop 115 is inverted. As a result, the transistor 108 is rendered inconductive so that no electric power is fed to the three-position plunger 44. As a result, similarly to the case in which there is none of the aforementioned records 130 and in which the repeat switch 13 is not pushed, the size reset lever 18 is mechanically locked by the size cam 40 so that the tone arm 6 is not led in. In this case, specifically, the start/stop switch 10 is pushed to rotate the drive gear 65 so that the tone arm 6 is held at its arm rest position as it is after it has been returned.
In the record player thus far described, if the start/
~top switch 10 is pushed during the record playing operation, this operation is also ended. More specifically, if the start/
stop switch 10 is pushed during the record playing operation, this switcil 10 generates a stop signal, which is dominant over all other signals to effect the stop condition. This operation is similar to that in case the tone arm 6 is not at its rest position when in the aforementioned starting operation, so that the plunger 82 is energized, when the start/stop switch 10 is turned on, to thereby effect one rotation of the drive gear 65. At this time, however, since the record is being played, the arm switch 22 is turned on so that the electric power is not fed to the three-position plunger 44. As a result, when nothing but the automatic returning operation is performed so that the tone arm 6 is swung to its rest position, the tone arm 6 is held in its rest position, as shown in Fig. 14, by the actions of the size cam 40 and the size reset lever 18 after it has been returned. In other words, in this case, the rear half rotation of the drive gear 65 is idle so that the record player is brought into its stop condition. It should, therefore, be noted here that the switch 10 selectively acts as a start switch and as a stop switch.
Moreover, even if any record 130 is left on the center spindle 5 when in the stopping operation, it never drops onto the turntable 3. In other words, since the three-position plunger 44 is deenergized, the size cam 40 is held in the position shown in Fig. 14. This position of the size cam 40 is fed back through the rod 50 to the feedbacklever 52 so that the leading end portion 138 of that lever 52 takes a position where it faces the projection 139 of the actuating lever 58. As a result, neither this actuating lever 58 can swing any more clockwise, as viewed in Fig. 14, about the pin 61, nor the detecting lever 60 swings in the same direction so that the dropping operation of the record 130 is not caused any more. The prohibition of that dropping operation is always performed in the case of the operations, in which the size cam 40 takes the position shown in Fig. 14 thereby to block the tone arm 6 from being led in.
As a result, none of the records 130 drop unless the record playing operation is performed.
In the record player thus far described, moreover, the tone arm 6 can be manually operated to play the records without any provision of the change-over switch between the automatic and manual operations. More specifically, when the tone arm 6 is led in by the manual operation, the lead-in lever 17 is swung to turn on the switch 22 shown in Fig. 4 so that the motor 38 is driven through the transistor 103.
As a result, the record playing operation is started. More-over, since the changed positions of the switch 22 and the cam switch 86 at that time are under the same condition as the case of the automatic operation and since the mechanisms are similar to those in the case of the automatic operation, this automatic operation is thereafter continued to effect the automatic changin~ operation or the automatic repeating operation.
If the tone arm 6 is returned to its arm rest position by the manual operation during the automatic playing operation, the stop condition is automatically invited. More specifi-cally, if the tone arm 6 is manually returned, the lead-in lever 17 is returned together so that its projection 20 pushes the arm switch 22. Then, this switch 22 is turned off so that the transistor 103 is also rendered inconductive. As a result, the motor 88 is stopped so that the turntable 3 LS accordingly stopped.
Having described specific ambodiments of the present invention with reference to the accompanying drawings, it is to be understood that the invention is not limited to those precise embodiment, and that various chan~es and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined ln the appended claims.
Claims (8)
1. A record changer including a center spindle on which records are held so that they may be dropped onto a turntable and may be played, said record changer comprising:
arm means for reproducing signals recorded in a record;
detecting means for detecting the position of said arm means;
operating means for controlling the drive and the stop of the record changer, the record changer being driven when said operating means is operated while it is being detected by said detecting means that said arm means is in an inoperative position; and means for stopping the drive of said record changer when said operating means is operated while it is being detected by said detecting means that said arm means is in an operative position.
arm means for reproducing signals recorded in a record;
detecting means for detecting the position of said arm means;
operating means for controlling the drive and the stop of the record changer, the record changer being driven when said operating means is operated while it is being detected by said detecting means that said arm means is in an inoperative position; and means for stopping the drive of said record changer when said operating means is operated while it is being detected by said detecting means that said arm means is in an operative position.
2. A record changer according to claim 1, wherein said detecting means for detecting the position of said arm means comprises an arm switch for detecting whether said arm means is in operative position or in inoperative position.
3. A record changer according to claim 1, wherein said means for stopping the drive of the record changer comprises a three position plunger which takes neutral position when said operating means is operated while it is being detected by said detecting means that said arm means is in its operative position, and record size selecting means interlocked with said three position plunger for selecting a record size, said record size selecting means holding said arm means in inoperative position after the returning operation thereof to bring said record changer in stop condition.
4. A record changer according to claim 1, wherein said record changer further comprises drive means for driving to rotate said arm means, a forward and a backward rotation of said arm means being accomplished by one cycle of said drive means, and means for changing over said record changer to an operating condition when said arm means is manually led in as that when said arm means is automatically led in.
5. A record changer according to claim 4, wherein said means for changing said record changer comprises detecting means for detecting the position of said arm means, and a detecting means for detecting the angular position of said drive means.
6. A record changer according to claim 5, wherein said detecting means for detecting the position of said arm means comprises an arm switch for detecting whether said arm means is in operative position or in inoperative position.
7. A record changer according to claim 1, wherein said record changer further comprises means for dropping a record held on said center spindle onto said turntable, said means for dropping a record being connected with said means for stopping so that the dropping operation of a record by said means for dropping a record is inhibited during operation of said operating means when said detecting means detects that said arm means is in an operative position.
8. A record changer according to claim 7, wherein said means for stopping the drive of the record changer comprises a three position plunger which takes neutral position when said operating means is operated while it is being detected by said detecting means that said arm means is in its operative position, a record size selecting means inter-locked with said three position plunger for selecting a record size, said record size selecting means holding said arm in inoperative position after the returning operation thereof to bring said record changer in stop condition, and prohibiting means to prohibit the dropping of the record from said center spindle, said prohibiting means being so coactive with said record size selecting means that said prohibiting means being effective when said three position plunger takes neutral position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34611/80 | 1980-03-18 | ||
| JP3461180A JPS56130862A (en) | 1980-03-18 | 1980-03-18 | Player with automatic changer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1162486A true CA1162486A (en) | 1984-02-21 |
Family
ID=12419158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000372924A Expired CA1162486A (en) | 1980-03-18 | 1981-03-13 | Record changer |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4412321A (en) |
| JP (1) | JPS56130862A (en) |
| CA (1) | CA1162486A (en) |
| DE (1) | DE3110332A1 (en) |
| GB (1) | GB2073932B (en) |
| NL (1) | NL8101332A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4788676A (en) * | 1986-12-19 | 1988-11-29 | Dennis James T | Record player |
| US20030030523A1 (en) * | 2001-08-09 | 2003-02-13 | Bell Dale K. | Regenerative shock absorber |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3489418A (en) * | 1966-03-15 | 1970-01-13 | Garrard Eng Ltd | Record changer |
| GB1515121A (en) * | 1975-03-27 | 1978-06-21 | Pico Electronics Ltd | Gramophone equipment |
| JPS5938663B2 (en) * | 1975-12-17 | 1984-09-18 | ソニー株式会社 | Fully automatic player |
| US4093832A (en) * | 1976-04-30 | 1978-06-06 | Marvin Glass & Associates | Programmable record changer |
| JPS52139403A (en) * | 1976-05-18 | 1977-11-21 | Nippon Gakki Seizo Kk | Arm control system |
-
1980
- 1980-03-18 JP JP3461180A patent/JPS56130862A/en active Pending
-
1981
- 1981-03-13 CA CA000372924A patent/CA1162486A/en not_active Expired
- 1981-03-17 DE DE19813110332 patent/DE3110332A1/en not_active Withdrawn
- 1981-03-17 GB GB8108367A patent/GB2073932B/en not_active Expired
- 1981-03-18 NL NL8101332A patent/NL8101332A/en not_active Application Discontinuation
- 1981-03-18 US US06/245,098 patent/US4412321A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US4412321A (en) | 1983-10-25 |
| GB2073932A (en) | 1981-10-21 |
| DE3110332A1 (en) | 1981-12-24 |
| JPS56130862A (en) | 1981-10-14 |
| GB2073932B (en) | 1984-02-01 |
| NL8101332A (en) | 1981-10-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |